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https://www.readbyqxmd.com/read/28543813/inhaled-pulmonary-vasodilator-therapy-for-management-of-right-ventricular-dysfunction-after-left-ventricular-assist-device-placement-and-cardiac-transplantation
#1
Leah A Sabato, David M Salerno, Jeremy D Moretz, Douglas L Jennings
Right ventricular failure (RVF) after cardiac transplant (CTX) or implantation of a continuous-flow left ventricular assist device (CF-LVAD) is associated with significant post-operative morbidity and mortality. A variety of modalities have been used to treat post-operative RVF, including management of volume status, intravenous inotropes and vasodilators, and right-sided mechanical support. Inhaled vasodilator agents are a unique treatment option aimed at minimizing systemic absorption by delivering therapy directly to the pulmonary vasculature...
May 24, 2017: Pharmacotherapy
https://www.readbyqxmd.com/read/28542952/compensatory-and-decompensatory-alterations-in-cardiomyocyte-ca-2-dynamics-in-hearts-with-diastolic-dysfunction-following-aortic-banding
#2
Sara Gattoni, Åsmund Treu Røe, Jan Magnus Aronsen, Ivar Sjaastad, William E Louch, Nicolas P Smith, Steven A Niederer
KEY POINTS: At the cellular level cardiac hypertrophy causes remodelling, leading to changes in ionic channel, pump and exchanger densities and kinetics. Previous studies have focused on quantifying changes in channels, pumps and exchangers without quantitatively linking these changes with emergent cellular scale functionality. Two biophysical cardiac cell models were created, parameterized and validated and are able to simulate electrophysiology and calcium dynamics in myocytes from control sham operated rats and aortic-banded rats exhibiting diastolic dysfunction...
May 21, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28534558/-proposing-a-physiological-model-for-emergency-department-operating-principles-classification-of-overcrowding-and-guidelines-for-redesign
#3
M Herrera Carranza, F Aguado Correa, N Padilla Garrido, F López Camacho
The operation of Emergency Departments (ED) is determined by demand, their own organizational structures and the connection to other medical care levels. When these elements are not simultaneous, it hinders patient flow and decreases capacity, making it necessary to employ a systemic approach to the chain of emergency care as a single operational entity. With this theoretical orientation, we suggest a conceptual model similar to the physiological cardiac output, in which the preload is the demand, the contractile or flow pump is the organizational structure, the afterload is the hospital, the pre-ED valve is primary care and outpatient emergencies, and the post-ED valve is the diagnostic support services and the specialist consultants...
April 30, 2017: Anales del Sistema Sanitario de Navarra
https://www.readbyqxmd.com/read/28533915/mechanisms-of-ecg-signs-in-chronic-obstructive-pulmonary-disease
#4
Marte Strømsnes Larssen, Kjetil Steine, Janne Mykland Hilde, Ingunn Skjørten, Christian Hodnesdal, Knut Liestøl, Knut Gjesdal
OBJECTIVE: Patients with chronic obstructive pulmonary disease (COPD) often have abnormal ECGs. Our aim was to separate the effects on ECG by airway obstruction, emphysema and right ventricular (RV) afterload in patients with COPD. METHODS: A cross-sectional study was performed on 101 patients with COPD without left heart disease and 32 healthy age-matched controls. Body mass index (BMI) was measured, and pulmonary function tests, ECG, echocardiography and right heart catheterisation (only patients) were performed...
2017: Open Heart
https://www.readbyqxmd.com/read/28533073/the-impact-of-sevoflurane-on-coupling-of-the-left-ventricular-to-systemic-vasculature-in-rats-with-chronic-pulmonary-hypertension
#5
Lu Wang, Hui Luo, Gang Qin, Yanan Cao, Xiaowei Gao, Zhong Zhang, Zhi Ye, Junjie Zhang, Qulian Guo, E Wang
OBJECTIVES: The relationship between left ventricular function and afterload has not been investigated as much as the right ventricular function under chronic pulmonary hypertension (PH) during anesthesia. This study was designed to investigate effects of sevoflurane on the intrinsic coupling relationship between the left ventricle and systemic vasculature in the presence of PH. DESIGN: A randomized, controlled study. SETTING: University hospital...
February 13, 2017: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/28506541/mitral-regurgitation-grading-in-the-operating-room-a-systematic-review-and-meta-analysis-comparing-preoperative-and-intraoperative-assessments-during-cardiac-surgery
#6
Filippo Sanfilippo, Christopher Johnson, Diego Bellavia, Marco Morsolini, Giuseppe Romano, Cristina Santonocito, Luigi Centineo, Federico Pastore, Michele Pilato, Antonio Arcadipane
OBJECTIVE: To assess differences in mitral regurgitation (MR) grade between the preoperative and the intraoperative evaluations. DESIGN: Systematic review and meta-analysis of 6 observational studies found from MEDLINE and EMBASE. SETTING: Cardiac surgery. PARTICIPANTS: One hundred thirty-seven patients. INTERVENTION: Comparison between the preoperative MR assessment and the intraoperative evaluation conducted under general anesthesia (GA), with or without "hemodynamic matching" (HM) (artificial increase of afterload)...
February 13, 2017: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/28497774/evaluation-of-respiratory-and-postural-induced-changes-on-the-ballistocardiogram-signal-by-time-warping-averaging
#7
Alba Martin-Yebra, Federica Landreani, Claudia Casellato, Esteban Enrique Pavan, Pierre-François Migeotte, Carlo Frigo, Juan Martinez Cortes, Enrico Caiani
OBJECTIVE: The aim of this work was to evaluate the potential changes in the ballistocardiogram (BCG) signal induced by different respiratory patterns and posture, by using the dynamic time warping (DTW) technique. APPROACH: BCG signals were recorded in a group of 20 healthy volunteers, simultaneously to the ECG. Two recordings, one in supine (SUP) and one in standing (ST) position, including spontaneous breathing, two 1-minute apneas (at full and empty-lungs, respectively) and 30s of Valsalva, were analyzed...
May 12, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28494976/prognostic-implications-of-moderate-aortic%C3%A2-stenosis-in-patients-with-left%C3%A2-ventricular-systolic%C3%A2-dysfunction
#8
Lennart van Gils, Marie-Annick Clavel, E Mara Vollema, Rebecca T Hahn, Ernest Spitzer, Victoria Delgado, Tamim Nazif, Peter P De Jaegere, Marcel L Geleijnse, Ori Ben-Yehuda, Jeroen J Bax, Martin B Leon, Philippe Pibarot, Nicolas M Van Mieghem
BACKGROUND: Left ventricular (LV) systolic dysfunction and moderate aortic stenosis (AS) are more frequent with advancing age and often coexist. Afterload reduction is the mainstay of pharmacological treatment of heart failure (HF). Aortic valve replacement (AVR) is only formally indicated for symptomatic severe AS. OBJECTIVES: This study sought to determine the clinical outcome of patients with concomitant moderate AS and LV systolic dysfunction. METHODS: Echocardiographic and clinical data of patients with moderate AS and LV systolic dysfunction between 2010 and 2015 from 4 large academic institutions were retrospectively analyzed...
May 16, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/28479295/the-beneficial-hemodynamic-effects-of-afterload-reduction-by-sodium-nitroprusside-during-rewarming-from-experimental-hypothermia
#9
Brage Håheim, Timofey Kondratiev, Erik Sveberg Dietrichs, Torkjel Tveita
BACKGROUND: Rewarming from hypothermia is associated with depressed cardiac function, known as hypothermia-induced cardiac dysfunction (HCD), and increased systemic vascular resistance (SVR). Previous studies on pharmacological treatment of HCD have demonstrated beneficial effects when using drugs with the combined effects; cardiac inotropic support and peripheral vasodilation. The presented study aims to investigate the isolated effects of arterial dilatation on cardiac functional variables during rewarming from hypothermia using sodium nitroprusside (SNP)...
May 4, 2017: Cryobiology
https://www.readbyqxmd.com/read/28475712/surgical-management-of-aortopulmonary-window-24-years-of-experience-and-lessons-learned
#10
Deepak Gowda, Trushar Gajjar, Jinaga Nageswar Rao, Praveen Chavali, Aaditya Sirohi, Naveen Pandarinathan, Neelam Desai
OBJECTIVES: Aortopulmonary window represents 0.2-0.3% of all congenital heart lesions. Progressive pulmonary arterial hypertension and its consequences are more common with this anomaly. The purpose of this study was to share 24 years of surgical experience in managing a spectrum of 55 cases of aortopulmonary window, followed up to 17 years in a single institution. METHODS: : This retrospective study was done from November 1991 to November 2015 of 55 patients with aortopulmonary window who underwent successful surgical repair...
May 5, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28470925/modalities-and-effects-of-left-ventricle-unloading-on-extracorporeal-life-support-a-review-of-the-current-literature
#11
Paolo Meani, Sandro Gelsomino, Eshan Natour, Daniel M Johnson, Hans-Peter Brunner La Rocca, Federico Pappalardo, Elham Bidar, Maged Makhoul, Giuseppe Raffa, Samuel Heuts, Pieter Lozekoot, Suzanne Kats, Niels Sluijpers, Rick Schreurs, Thijs Delnoij, Alice Montalti, Jan Willem Sels, Marcel van de Poll, Paul Roekaerts, Thomas Poels, Eric Korver, Zaheer Babar, Jos Maessen, Roberto Lorusso
INTRODUCTION/AIM: Veno-arterial extracorporeal membrane oxygenation (V-A ECMO) support is increasingly used in refractory cardiogenic shock and cardiac arrest, but is characterized by a rise in afterload of the left ventricle (LV) which may ultimately either further impair or delay cardiac contractility improvement. The aim of this study was to provide a comprehensive overview regarding the different LV venting techniques and results currently available in the literature. METHODS: A systematic literature search was performed in the PubMed database: 207 articles published between 1993 and 2016 were included...
May 2017: European Journal of Heart Failure
https://www.readbyqxmd.com/read/28469078/mir-21-is-associated-with-fibrosis-and-right-ventricular-failure
#12
Sushma Reddy, Dong-Qing Hu, Mingming Zhao, Eddie Blay, Nefthi Sandeep, Sang-Ging Ong, Gwanghyun Jung, Kristina B Kooiker, Michael Coronado, Giovanni Fajardo, Daniel Bernstein
Combined pulmonary insufficiency (PI) and stenosis (PS) is a common long-term sequela after repair of many forms of congenital heart disease, causing progressive right ventricular (RV) dilation and failure. Little is known of the mechanisms underlying this combination of preload and afterload stressors. We developed a murine model of PI and PS (PI+PS) to identify clinically relevant pathways and biomarkers of disease progression. Diastolic dysfunction was induced (restrictive RV filling, elevated RV end-diastolic pressures) at 1 month after generation of PI+PS and progressed to systolic dysfunction (decreased RV shortening) by 3 months...
May 4, 2017: JCI Insight
https://www.readbyqxmd.com/read/28468975/physiology-of-angina-and-its-alleviation-with-nitroglycerine-insights-from-invasive-catheter-laboratory-measurements-during-exercise
#13
Kaleab N Asrress, Rupert Williams, Timothy P Lockie, Muhammed Z Khawaja, Kalpa De Silva, Matthew Lumley, Tiffany Patterson, Satpal S Arri, Sana Ihsan, Howard Ellis, Antoine Guilcher, Brian R Clapp, Philip J Chowienczyk, Sven Plein, Divaka Perera, Michael Marber, Simon R Redwood
Background -The mechanisms governing exercise-induced angina and its alleviation by the most commonly used anti-anginal drug, nitroglycerine (GTN), are incompletely understood. The purpose of this study was to develop a method with which the effects of anti-anginal drugs could be evaluated invasively during physiological exercise to gain further understanding as to the clinical impact of angina and GTN. Methods -40 Patients (mean 65.2±7.6 years) with exertional angina and coronary artery disease underwent cardiac catheterisation via radial access and performed incremental exercise using a supine cycle ergometer...
May 3, 2017: Circulation
https://www.readbyqxmd.com/read/28468272/clinical-correlates-and-prognostic-value-of-plasma-galectin-3-levels-in-degenerative-aortic-stenosis-a-single-center-prospective-study-of-patients-referred-for-invasive-treatment
#14
Beata Bobrowska, Ewa Wieczorek-Surdacka, Olga Kruszelnicka, Bernadeta Chyrchel, Andrzej Surdacki, Dariusz Dudek
Galectin-3 (Gal-3), a β-galactoside-binding lectin, has been implicated in myocardial fibrosis, development of left ventricular (LV) dysfunction and transition from compensated LV hypertrophy to overt heart failure (HF), being a novel prognostic marker in HF. Risk stratification is crucial for the choice of the optimal therapy in degenerative aortic stenosis (AS), affecting elderly subjects with coexistent diseases. Our aim was to assess correlates and prognostic value of circulating Gal-3 in real-world patients with degenerative AS referred for invasive treatment...
April 29, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28447738/telmisartan-suppresses-cardiac-hypertrophy-by-inhibiting-cardiomyocyte-apoptosis-via-the-nfat-anp-bnp-signaling-pathway
#15
Xiurong Li, Yuhuai Lan, Yan Wang, Minghao Nie, Yanhong Lu, Eryang Zhao
Telmisartan, a type of angiotensin II (Ang II) receptor inhibitor, is a common agent used to treat hypertension in the clinic. Hypertension increases cardiac afterload and promotes cardiac hypertrophy. However, the ventricular Ang II receptor may be activated in the absence of hypertension. Therefore, telmisartan may reduce cardiac hypertrophy by indirectly ameliorating hypertensive symptoms and directly inhibiting the cardiac Ang II receptor. Nuclear factor of activated T‑cells (NFAT) contributes to cardiac hypertrophy via nuclear translocation, which induces a cascade of atrial natriuretic peptide (ANP) and brain/B‑type natriuretic peptide (BNP) expression and cardiomyocyte apoptosis...
May 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28436407/design-of-a-pulsatile-dc-electromagnetic-blood-pump-for-ecmo
#16
Jingjing Liu, Bin Ge, Tong Lu
BACKGROUND: Extracorporeal membrane oxygenation (ECMO) has developed rapidly and become a significant treatment for emergency. Current blood pumps for ECMO have different disadvantages. OBJECTIVE: To design a pulsatile DC electromagnetic blood pump for ECMO. METHODS: The design is presented with a driving principle which the rectilinear reciprocation of a magnet inside energized solenoids is implemented, and with a structure of solenoids with compensation coils...
April 14, 2017: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
https://www.readbyqxmd.com/read/28434968/cardiac-contractility-correction-strategies-applied-to-telemetry-data-from-a-hesi-sponsored-consortium
#17
Emmanuel Boulay, Michael K Pugsley, Vincent Jacquemet, Alain Vinet, Michael V Accardi, Maxim Soloviev, Eric Troncy, Jennifer M Doyle, Jennifer Beck Pierson, Simon Authier
INTRODUCTION: QT has a long history of heart rate (HR) correction but limited investigations have been undertaken to assess the impact of cardiovascular parameters on left ventricular (LV) contractility in drug safety testing. Cardiac contractility is affected by preload (Cyon-Frank-Starling law), afterload (Anrep effect) and HR (Bowditch effect). We evaluated multi-parameter correction methods to help with dP/dtmax interpretation. METHODOLOGY: Modeling was undertaken using data from dogs in single or double 4×4 Latin square studies...
April 20, 2017: Journal of Pharmacological and Toxicological Methods
https://www.readbyqxmd.com/read/28431936/galectin-3-mediates-the-pulmonary-arterial-hypertension-induced-right-ventricular-remodeling-through-interacting-with-nadph-oxidase-4
#18
Jingni He, Xiaohui Li, Hui Luo, Tangzhiming Li, Lin Zhao, Qiangqiang Qi, Yuwei Liu, Zaixin Yu
Pulmonary arterial hypertension (PAH) is a progressive disorder that affects both pulmonary vasculature and the heart. The response of the right ventricle (RV) to the increased afterload is an important determinant of the PAH final outcome. Galectin-3 (Gal-3), a novel biomarker in left cardiac remodeling, takes part in multiple pathophysiological processes including the inflammation, fibrosis, immunity, and oxidative stress. The levels of Gal-3 are elevated in PAH patients, although the exact mechanisms underlie the PAH-induced right ventricular structural changes remain unclear...
March 27, 2017: Journal of the American Society of Hypertension: JASH
https://www.readbyqxmd.com/read/28407402/cirrhotic-cardiomyopathy-implications-for-liver-transplantation
#19
REVIEW
Hongqun Liu, Saumya Jayakumar, Mouhieddin Traboulsi, Samuel S Lee
The majority of the patients on a waiting list for liver transplantation have end-stage liver disease. Due to the marked peripheral vasodilatation of end stage cirrhosis that masks a latent myocardial dysfunction, cardiac abnormalities in the resting state are usually subclinical and escape the attention of physicians. However, when challenged, the systolic and diastolic contractile responses are attenuated. In addition to these contractile abnormalities, morphological changes such as enlargement or hypertrophy of cardiac chambers and electrophysiological repolarization changes including a prolonged QT interval can be observed...
April 13, 2017: Liver Transplantation
https://www.readbyqxmd.com/read/28405943/myocardial-oxidative-stress-correlates-with-left-ventricular-dysfunction-on-strain-echocardiography-in-a-rodent-model-of-sepsis
#20
Bereketeab Haileselassie, Erik Su, Iraklis Pozios, Diego F Niño, Hongyun Liu, Dai-Yin Lu, Ioannis Ventoulis, William B Fulton, Chhinder P Sodhi, David Hackam, Brian O'Rourke, Theodore Abraham
BACKGROUND: Recognition of cardiomyopathy in sepsis can be challenging due to the limitations of conventional measures such as ejection fraction (EF) and fractional shortening (FS) in the context of variable preload and afterload conditions. This study correlates myocardial function using strain echocardiography (SE) with cardiomyocyte oxidative stress in a murine model of sepsis. METHODS: C57BL/6J mice were randomized into control (n = 10), sham (n = 25), and a cecal ligation and puncture (CLP) (n = 33) model of sepsis...
December 2017: Intensive Care Medicine Experimental
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